כָּל־דָּבָ֞ר אֲשֶׁר־יָבֹ֣א בָאֵ֗שׁ תַּעֲבִ֤ירוּ בָאֵשׁ֙ וְטָהֵ֔ר אַ֕ךְ בְּמֵ֥י נִדָּ֖ה יִתְחַטָּ֑א וְכֹ֨ל אֲשֶׁ֧ר לֹֽא־יָבֹ֛א בָּאֵ֖שׁ תַּעֲבִ֥ירוּ בַמָּֽיִם׃
무릇 불에 견딜 만한 물건은 불을 지나게 하라 그리하면 깨끗하려니와 오히려 정결케 하는 물로 그것을 깨끗케 할 것이며 무릇 불에 견디지 못할 모든 것은 물을 지나게 할 것이니라
Rashi on Numbers
כל דבר אשר יבא באש ANYTHING THAT COMES ON THE FIRE, to boil something in it,
Ramban on Numbers
EVERY THING THAT MAY COME INTO THE FIRE YE SHALL PASS THROUGH THE FIRE AND IT SHALL BE CLEAN. A vessel which touched a human corpse or dead animal does not become purified by fire, since the immersion mentioned in the Torah is always in water. Therefore our Rabbis had to explain97Abodah Zarah 75b. that this purification [mentioned here by Scripture] refers to remove from them [the traces of] the forbidden foods which they had absorbed whilst they were in the possession of the non-Jews. This is the true [explanation] without any doubt.
Sforno on Numbers
וטהר, it will have become decontaminated from the negative vibes attached to it as residue of idolaters.